package com.wingsfrog.puzzle.util;

import java.util.Random;

/**
 * Created by rankin on 16/3/30.
 */
public class RandomUtil {
    public static String generateToken(Integer length){
        String prefix = "TOK";
        return prefix + getRandomString(length-3);
    }

    public static String getRandomString(int length) { //length表示生成字符串的长度
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
    public static String generateOrderNo(Integer length) {
        String prefix = "OD";
        return prefix + getRandomString(length);

    }
}
